【摘要】：無(wú)損檢測(cè)技術(shù)已在各個(gè)領(lǐng)域中得到廣泛的應(yīng)用。無(wú)損檢測(cè)技術(shù)應(yīng)用在錨桿錨固領(lǐng)域中,和以往的破壞性檢測(cè)不同,不需要破壞錨固結(jié)構(gòu)就能很好的檢測(cè)到錨桿錨固的特性。應(yīng)力波反射法檢測(cè)錨桿是一種實(shí)用性較強(qiáng)的錨桿錨固質(zhì)量無(wú)損檢測(cè)方法,本文使用該方法檢測(cè)錨桿錨固的質(zhì)量,主要進(jìn)行了以下內(nèi)容的研究： (1)闡述應(yīng)力波反射法的可行性,利用應(yīng)力波反射法能夠檢測(cè)錨桿錨固系統(tǒng)的質(zhì)量。 (2)利用實(shí)驗(yàn)室自行開發(fā)的嵌入式的錨桿錨固無(wú)損檢測(cè)設(shè)備對(duì)實(shí)驗(yàn)室中的錨桿錨固模型進(jìn)行無(wú)損檢測(cè),利用小錘敲擊錨桿頂端(錨頭)產(chǎn)生應(yīng)力波,嵌入式錨桿無(wú)損檢測(cè)設(shè)備能夠有效的檢測(cè)到錨桿錨固中的小錘敲擊信號(hào),而后利用相關(guān)算法對(duì)接收到的波形信號(hào)做相關(guān)分析,得出信號(hào)處理后的波形,從波形中很好的反映了信號(hào)的特性,并且能夠清晰的找出應(yīng)力波的反射時(shí)刻。 (3)利用有限元分析軟件ANSYS/LS-DYNA建立了裸桿、帶錨固錨桿和缺陷錨桿錨固模型,對(duì)加載載荷和邊界條件后的數(shù)值模型進(jìn)行求解分析,與試驗(yàn)波形進(jìn)行對(duì)比分析,結(jié)果表明利用有限元分析軟件ANSYS/LS-DYNA能夠較好的模擬錨桿的應(yīng)力波無(wú)損檢測(cè)過程,模擬結(jié)果和實(shí)驗(yàn)結(jié)果基本吻合,應(yīng)力波在錨固上下界面、缺陷上下界面反射位置清晰可見,利用公式能夠準(zhǔn)確的計(jì)算出錨桿長(zhǎng)度、錨固長(zhǎng)度和缺陷的所在位置,數(shù)值模擬的應(yīng)力波反射位置和缺陷位置基本符合試驗(yàn)結(jié)果。 (4)進(jìn)一步利用ANSYS/LS-DYNA模擬設(shè)計(jì)了4m錨桿的數(shù)值模型,在錨固中,缺陷位置不同時(shí),得出應(yīng)力波的反射波形,不同錨桿長(zhǎng)度時(shí)的應(yīng)力波反射波形,計(jì)算結(jié)果表明缺陷的位置和原本設(shè)計(jì)的缺陷位置符合程度高。
[Abstract]:Nondestructive testing technology has been widely used in various fields. Non-destructive testing (NDT) technology is used in the field of bolt Anchorage. Different from the previous destructive testing, the characteristics of Anchorage can be well detected without destroying the Anchorage structure. The stress wave reflection method is a practical nondestructive testing method for bolt anchoring quality. The main contents are as follows: (1) the feasibility of stress wave reflection method is expounded. The stress wave reflection method can be used to detect the quality of anchor system. (2) Non-destructive testing equipment developed by the laboratory is used to test the anchoring model in laboratory. Stress wave is generated by hammer-percussion on the top of anchor rod (anchor head). Embedded anchor nondestructive testing equipment can effectively detect the hammer knock signal in anchor bolt, and then use correlation algorithm to analyze the received waveform signal. The waveform after signal processing can reflect the characteristics of the signal, and the reflection time of the stress wave can be clearly found. (3) the bare rod is established by using the finite element analysis software ANSYS/LS-DYNA. The anchoring model with anchoring rod and defective anchor rod is solved and analyzed after loading load and boundary condition, and compared with the test waveform. The results show that the finite element analysis software ANSYS/LS-DYNA can well simulate the stress wave nondestructive testing process of the anchor rod. The simulation results are in good agreement with the experimental results. The stress wave is in the upper and lower interface of the anchor, and the reflection position of the upper and lower interface of the defect is clearly visible. The length of anchor rod, the length of anchor and the position of defect can be calculated accurately by using the formula. The reflected position of the stress wave and the position of the defect in the numerical simulation basically accord with the test results. (4) the numerical model of the 4m bolt is designed by using ANSYS/LS-DYNA simulation. In the anchoring, the reflection waveform of the stress wave is obtained at different position of the defect. The results show that the positions of the defects are in good agreement with the original designed ones.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU47;TB302.5

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